I've used a dab of the liquid electrical tape and 15 years later the repair is still good.
I’ve successfully used the liquid electrical tape, too.
Apply the electrical tape with the bellows extended. Let it dry for a couple hours before you rack it in and compress it. Otherwise, it will stick to itself. For a pinhole just a dot will do it. The problem, of course, is that pinholes tend to be like pimples. Not many people get just one. Over time.
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